Experimental Research On Magnesium Particles Combustion Mechanism In Water Ramjet Engine

At present,studies ofmagnesium-basedwaterramjet enginearemainlyfocusedoncombustion optimization of the engine and magnesium-based propellants and enginetests domestically. However, no exact numerical model has been used to describe thecombustion of magnesium particles and water in the engine, as the physical process isstill not clear. In this paper, by the method of experimental research, applied withtheoretical analysisandnumericalsimulation,thephysicalprocess,burningandignitiontemperature, combustion time characteristics of magnesium particle's burning in steamis carried out for further development of internal combustion organization ofmagnesium-basedwaterramjet.By analysis the basic theory of burning of metal particles, a test system withefficiency observational approaches is designed to carry out the combustion ofmagnesium particles with different diameters in air experimental research. Ignitiontemperatureandcombustiontimecharacteristicdataofmagnesiumparticlescombustionis received. the main physical processes and related parameters is carried out on thebasisofmagnesiumparticlescombustionphenomenaanddata.Based on experimental research of the combustion of magnesium particles in airand the conclusions of test content, making rich observation methods, the paperlaunched a magnesium particles in the water vapor in the combustion test. Reach aconclusion that the ignition ofa single magnesium particles in stationarywater vapor iscontrolled by the multiphase chemical reaction dynamics, and combustion is controlledby the diffusion of gas, especial floc is produced by the combustion progress. In thewater vapor environment of this paper, magnesium particle diameter and the watervapor pressure change have a small impact on particle ignition temperature, the changeof water vapor pressure take a greater impact on the maximum flame temperature whenthe particle is burning, the burning time of the particle consistent D 2law when theparticlediameterissmall.A magnesium particle combustion model in water ramjet engine is obtained byanalyzing and summarizing the combustion phenomena and the experimental data ofmagnesiumparticles combustioninwaterandair.Usingthismodel,comparingwiththemethodwhichtreatmagnesiumasvapor,thispapercarryout aNumericalSimulationofthe internal combustion organization of the water ramjet engine. The results show thatthe numerical simulation use this model is better to reflect the actual process ofcombustionintheengine.